Kamarul Zaman, Muhammad Akramin. 2017. “Sah (الصحة) Dan Batal (البطلان) Menurut Ulama Usul Fiqh: Validity and Invalidity According to Scholars of Islamic Jurisprudence Principle”. Perspektif Jurnal Sains Sosial Dan Kemanusiaan 9 (3):116-24. https://ojs.upsi.edu.my/index.php/PERS/article/view/1772.